(2x-3)+(x+39)=90

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Solution for (2x-3)+(x+39)=90 equation: 



(2x-3)+(x+39)=90

We move all terms to the left:

(2x-3)+(x+39)-(90)=0

We get rid of parentheses

2x+x-3+39-90=0

We add all the numbers together, and all the variables

3x-54=0

We move all terms containing x to the left, all other terms to the right

3x=54

x=54/3

x=18

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